Process for making lines and water-marks on paper and apparatus therefor



0. SUURSALMI. PROCESS FoR MAKING LINES AND WATER MARKS 0N PAPER AND APPARATUS THEREFOR.

APPLICATION FILED AUG. 13. I919.

1,329, 100, Patented Jan. 27, 1920 7 772,1. mm w aj AT Y nmrn srnzrns PATENT ()FFICE.

ONNI sUUnsALMI, F JYvAsKYLA, FINLAND, ASSIGNOR 'ro KANGAS PAPPERSBRUKS AKTIEBOLAG, or JYvAsKYLA, FINLAND, A COMPANY INCORPORATED IN FINLAND.

PnocEss FOR MAKING LINES AND WATER-MARKS 0N PAPER AND APPARATUS THEREFOR.

Specification of Letters Patent.

Patented Jan. 27, 1920.

. Application filed August 13, 1919. Serial No. 317,278.

To all whom it may concern:

Be it known that I, ONNI SUURsALMI,

. of Jyvaskyla, Finland, manager of paper works, a citizenof Finland, have invented a certain new and useful Improved Process less moving belt or strip of cloththrough which the Water filters away leaving a fibrous material on the cloth from which the finished paper is produced. For the purpose of further drying the paper the endless cloth is led o'ver vacuum boxes which do not efiect any marking of the paper and in some cases is led between rolling presses, calendering rolls or the like. I I

In the'improved process according to this invention a regulated flow of water is supplied at a series of predetermined points to the under side of the endless cloth and thence to the pul thereon which is thus loosened in passing over those points, while simultaneously a regulated suction eflect is applied at a series of other predetermined points to the under side of the endless cloth, so that as the cloth passes over these pointspart of the pulp is moved away from the first mentioned series of points andis drawn toward'the second mentioned series of points, thus making the pulp thinner at the former and thicker at the latter points and causing the paper to be marked in a corresponding manner.

For the purpose of carrying out the invention I make use of a special apparatus which I call a marking box, an end view and a plan of which are illustrated in the accompanyin drawings.

igure 1 is an end View of the marking box and Fig. 2 is a plan view.

Referring. to the drawings the marking box consists of two chambers A and B and is shown arranged with its length transversely across the path of the endless circulating cloth D moving in the direction of the arrow and carrying a sheet of pulp P the cover of the marking box being shown at L. for Making Lines and Water-Marks on The chamber A. of the marking box is supplied with water from any suitable source by means of a pipe (not shown) containing means for very accurately regulating the pressure of the flow therethrough and for totally shutting off the supply when desired; for this purpose any suitable or known regulating device may be used. The chamber B is connected to the vacuum pump or other exhaustin device attached to the paper machine, or may be connected to a separate exhausting device of any suitable kind (not shown) and this connection also is provided with any suitable or known vacuum-regulating means. In the cover L of the marking box two series of passages or openings H and H are formed, one series H connected to the water chamber A and the other series of passages H connected to the vacuum chamber B. The upper ends of these passages terminate in openings in the cover L of the marking box which openings may be arra ged in any desired manner according to the nature of the marks which it is desired to impart to the paper under treatment. In the arrangement shown all the openings in the cover of the marking box are arranged in one straight line and consequently are adapted to form straight line' marks upon or within the substance of the paper as it is carried over the openings by the endless cloth D.

In operation the pressure water from chamber A of the marking box being ad mitted to the passages H and the suction action from chamber B being admitted to the passages H it will be seen that a series of pressure points and a series of is loosened and forced away from the former and is drawn to the latter points thus making the pulp sheet thinner at the ressure points and thicker at the suction polnts and causing lines called water-marks to' appear in the substance of the paper. The particular effect produced upon the paper depends upon the arrangement of the upper openings of the passages H and H in the cover of the marking box,-and the nature of the 1 pressure and suction actions,that is, whether these are continuous or intermittent. It is not necessary to arrange the sand openings in a straight line but they may be arranged usual vacuum box of a paper machine andmay be fitted with the usual regulator employed therewith.

It will be evident that the details both of the improved process and also of the.

construction of the marking box employed may be cbnveniently varied without exceed-/ ing the scope of the invention.

What I claim and desire to secure by Letters Patent is l. The process of making lines and water marks on paper during manufacture of the latter which consists in providing a series of apertures arranged in a manner corresponding to the desired lines or marks at predetermined points in the path to be traversed by the paper" pulp during manufacture, and supplying a regulated fiow of water to some and a regulated suction effect to others of the said apertures as the said paper pulp passes over them.

2. Apparatus for making lines and water marks on paper during manufacture, comprising a marking box, a partition therein dividing the interior of the box into two chambers, means for supplying water to one chamber, means for creating a vacuum in the other chamber a series of apertures arranged in the path of the paper pulp so as to correspond to the desired lines or marks, and means for connecting the water chamber of the marking box to some of the said apertures and the vacuum chamber to others of the said apertures.

3. Apparatus for making lines and water marks on paper during manufacture, comprising a marking box, a partition therein dividing the interior of the box into two chambers, means for supplying water to one chamber, means for creating a vacuum in the other chamber, a series of apertures arranged in the path of the paper pulp to correspond to the desired lines or marks and means for connecting every alternate aperture to the water chamber and the intermediate apertures to the vacuum chamber of the marking box.

" ONNI SUURSALLH.

Witnesses:

VIKING BECKMAN, Emo RAEKs'rRoM. 

